# Model Access Gateway – Mistral Large 4 Chat Completions (x402)

> Model Access Gateway – Mistral Large 4 Chat Completions (x402) is a paid API for AI agents from modelaccessgateway.com, paid per call via x402, $0.0023/call, status unknown (last checked 2026-10-16).

Runs OpenAI-compatible chat completions using Mistral Large 4, paid per call in USDC via x402 with no account or API key required.

## Facts

- Endpoint: POST https://modelaccessgateway.com/llm/mistral-large-4?utm_source=zero.xyz
- Price: $0.0023/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/model-access-gateway-mistral-large-4-chat-completions-x402-47f66c33
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TjYaY7P1heHMjiBt4AXjK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability model-access-gateway-mistral-large-4-chat-completions-x402-47f66c33 -d '<json body>'
```

Example prompt: Ask Mistral Large 4 to write a concise executive summary of the following meeting notes, with max 500 tokens and a temperature of 0.3, and pay per call without needing an API key: [paste notes here].

## When to prefer this

Choose this endpoint when you need Mistral Large 4 specifically (strong reasoning, multilingual, large context) and want zero-friction access — no account signup, no API key management, and automatic refund on failure. Ideal for autonomous agents that need pay-per-use economics, crypto-native workflows paying in USDC on Base, or ephemeral use cases where maintaining API credentials is undesirable.

## Known failure modes

- Payment failure or insufficient USDC balance — x402 payment rejected, no completion returned
- Model overload or upstream Mistral outage — 5xx error returned, automatic refund issued
- Invalid messages array (empty or malformed) — 422 validation error
- max_tokens exceeds 16384 — 422 validation error
- Temperature out of 0–2 range — 422 validation error
- Network timeout during streaming — partial SSE stream, no refund guarantee

## How this service works

LLM inference API: OpenAI-compatible chat completions for 136 AI models (Claude, GPT, Gemini, Grok, DeepSeek, Qwen, Kimi, GLM), paid per call in USDC on Base with x402. No account, no API key, automatic refund if the model fails.

## Output

Returns an OpenAI-compatible chat.completion JSON object containing the assistant's message content, finish reason (stop/length/tool_calls), token usage breakdown (prompt, completion, total), model identifier, and a unique completion ID. Supports streaming via server-sent events when stream=true.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Optional: fixed by the route (mistral/mistral-large-4)"
  },
  "tools": {
   "type": "array"
  },
  "stream": {
   "type": "boolean",
   "description": "true: server-sent events after payment"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant",
       "tool",
       "developer"
      ],
      "type": "string"
     },
     "content": {
      "type": [
       "string",
       "array",
       "null"
      ]
     }
    }
   },
   "minItems": 1
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 16384,
   "minimum": 1,
   "description": "Optional, default 4096"
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  },
  "response_format": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-7f3c2a91",
  "model": "mistral/mistral-large-4",
  "usage": {
   "total_tokens": 10,
   "prompt_tokens": 9,
   "completion_tokens": 1
  },
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "OK"
    },
    "finish_reason": "stop"
   }
  ],
  "created": 1791979200
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/model-access-gateway-mistral-large-4-chat-completions-x402-47f66c33/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from modelaccessgateway.com](https://www.zero.xyz/host/modelaccessgateway.com/llms.txt)